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I have checked in the information of your Yonex Yonex Ti 10 shaft Serial:8053305; Cone Code:101188SP (date=11 Nov 2008) to my information list of Yonex rackets made in Japan, its shaft serial and cone code are legitimate.

However you still need to inspect the other physical features of the racket carefully and compare the specifications to ascertain its total legitimacy or authenticity yourself.